From ca16eacf2515acf9d81a4a6ae6503f3a2a931a8b Mon Sep 17 00:00:00 2001
From: Panu Horsmalahti <panu.horsmalahti@iki.fi>
Date: Fri, 31 Jan 2014 00:00:35 +0200
Subject: [PATCH] fix($compile): throw an exception when an attribute is
 unassigned

Documentation states that NON_ASSIGNABLE_MODEL_EXPRESSION exception should be thrown if
a two-way attribute doesn't exist. This commit adds a simple test and throws an error
if the property is missing. Note that the documentation should probably be updated
and a different exception should be thrown using minErr.

This commit refers to issue #6060
---
 src/ng/compile.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ng/compile.js b/src/ng/compile.js
index 941b449ad359..100081952020 100644
--- a/src/ng/compile.js
+++ b/src/ng/compile.js
@@ -1906,8 +1906,12 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
                 break;
 
               case '=':
-                if (optional && !attrs[attrName]) {
-                  return;
+                if (!attrs[attrName]) {
+                  if (optional) {
+                    return;
+                  }
+                  throw Error('Non-assignable model expression: ' + attrs[attrName]
+                    + ' (directive: ' + newIsolateScopeDirective.name + ')');
                 }
                 parentGet = $parse(attrs[attrName]);
                 if (parentGet.literal) {